Type
Zone
Age range
427–426 Ma
Ludlow
Gorstian
Wenlock
Homerian
Ancoradella ploeckensis
Kockelella variabilis variabilis
Kockelella crassa
427.0426.9426.9426.9426.8426.8426.7426.6426.6426.6426.5426.4426.4426.4426.3426.3426.2426.1426.1426.1426.0